Sound recording and reproducing device



y 4, 1939- c. w. NYSTROM 2,164,778

SOUND RECORDING AND REPRODUCING DEVICE File d Nov. 13, 1957 2 Sheets-Sheet 1 A VIIIIIIIIIIIIIIIIIII 4 23' ZYT If 8 Fl T L7? H 7 1522.. 8,

. INVENTOR 09a W/Ll/EAM m sreom 05:59:50 60 /-/EMP//r Fqa/a/v STEM/14M eaww/wsreefag MI-IY y 4,1939- k c. W.NYSTROM 2,164,778

SOUND RECORDING AND REPRODUCING DEVICE WIf/IIIIII/lll Patented JuIy4, 193 9 I V i Q I Q I I umraojs'rarss PATENT orr ce cm Wilhelm Nystrorn, deceased, late of kmltad, Sweden, by Henrik Fabian Stenman, administrator, Karlatad, Sweden ApplicationNovember 13, 1937, Serial No. 174,462 12Ciaims. (01. 214- "misinvention relates to sound recording and As shown in Figs. 1 and 2; the apparatus is reproducing means and-more specifically to sound provided with a base plate l',--'carrying supports, recording and reproducing means having -a. turn- 2. for a shaft 3. Theshaft 3 is connected with tabl a iat th r it t one 'arm of a carrier, preferably U'-shaped, in

'5- In general, it is an object of the invention to which the pivot iii of a turntable l is mounted provide a device of the character described, rotatably. The turntable is adapted to carry a which will emciently perform the purposes for record or a disc of wax. The other arm 5 of-the which it is intended, which is simple and ecocarrier is provided with a member, say in the form nomical of construction, which can be expedlof a roller 1, mounted-on a spring-actuated pin 10 tiously, conveniently and safely manipulated, and 0. and adapted to engages. suitable operating. 10

which can be readily manufactured andassemmember which, in the embodiment shown,..conbled, I sists of an ecoentricii. The eccentric is at Y Another object of the invention is to provide a tached to an axis I: mounted in supports I. 1 device of the above type wherein the turntable When the axis is rotated in one direction or the. 16 may be separated from the motivating elements other, the carrier 4 will'be lifted or lowered to-, II

' by a motion of the former and wherein such gether with, the turntable. The driving means, separation is brought about automatically and/or of the turntable comprises a rotating' 'friction manually and/or at the end of'a predetermined wheel ll, which rotates the turntable by friction, period and/or" at a predetermined. position of and which, during therotatingmovementfls 20 certain of the motivating elements; to provide placed radially in relation to the said turntable.- 20 such a device wherein resilient means, which The radial movement may be achieved by means are one of the means which cause the said sep- 01 a screw, threads or another suitable device. aration, are also available to give resilient con- A simple construction is disclosed on the drawtact between the. turntable and the elements ings, according'to which the'fri'ction wheel itself' motivating it; and to provide such a' device, isprovided with ribs, cams or grooves, which are 85 1 wherein the motivating elements are caused to closed round the periphery and which, when the" cease to motivate when said separation takes friction wheel engages the'turntable', mesh with place. a'helical groove arranged at the lowersurface Other objects of the invention will in part he of the turntable. Due to this arrangement, the so obvious and will in part appear hereinafter. I friction wheel will befed to the center or the The invention accordingly comprises the feaperiphery of the turntable and, at the same time, tures of construction, combination of elements, the friction wheel will rotate the turntable. If and arrangement of parts, whichwill be exemthe friction wheel rotates at constant velocity, of

'plified in the construction hereinafter set forth rotation, those points which are on the upper sur a 5 and the scope of the application of which will face of the turntable and which are successively,"

be indicated in the claims. v directly above the friction wheel will rotate at For a fuller understanding of the nature and a constantlinear velocity. objects of the invention, reference should be had The friction wheel is combined with a guiding to the following detailed description, taken in collar l4 ,and a journal i5, both being slidably 4 connection with the accompanying drawings, in mounted on a rod it supported in supports ll. 40 which: The journal i5 does nottake any part in the ro- Figure -1 is a vertical view of a device embodytation "of the friction wheel. Special means may ing one form of the invention, partly in secbe provided in order to prevent the journal from tion; rotating, e. g., comprising a guiding roller 34 5 Fig. 2 is a plan view of the device shown in combined with the journal and guided on a shaft Fig. 1; 33 (Fig. '7). The rod is is rotated by means of Fig. 3 is a view in elevation, partly in section, driving means (not shown) connected to a transof the device shown in Fig. 1; mission wheel iii. In order to cause the friction Figs. 4 and 5 show details of the device shown wheel to rotate and to be displaced along the in Fig. 1; rod [6, there may be arranged suitable means, 50 Fig. 6 illustrates another embodiment of the e. g., a pin or the like engaging an axial groove invention; and in the rod.

Figs. 7 and 8 are views, in elevation and in Instead of causing the friction wheel Ii to plan, of still another embodiment, of the invenengage with the lower surface of the turntable, tion, with some parts omitted. there may be arranged a special driving table '55-.

adapted to be rotated by the friction wheel and connected to the turntable in a suitable manner.

The recording means and the reproducing means together with the usual horn are not shown on the drawings. In the operation of the apparatus,--the friction wheel is displaced radially in relation to the turntable, usually toward its center. At the same time, the recording member or the needle moves on the wax disc or the record,

respectively, in thedirection toward the center of the disc. For this purpose, the carrier of the recording member maybe connected to the friction wheel or its guiding collar l4 or journal [5 in a suitable manner, but the needle is guided in the usual manner by the helical groove of the record.

After having recorded the wax disc or after having played the record, the friction wheel, which now has reached its inner position on the helical groove of the turntable, must be returned to its outer position in order to enable a new record disc to be'played. For this purpose, it is necessary to release the friction wheel from its engagement with the lower surface of the turntable. According to the embodiment shown, this result is achieved 'by connecting the carrier 4 with a spring 24 attached at the base plate and acting to draw the carrier 4 upwardly. During the operation of the apparatus, the carrier and the turntable are pressed downwardly by means of the eccentric I3 against the action of the spring 24, but-when it is desired to effect the release, the eccentric is rotated so that its cam releases the roller" 1;whereby the spring 24 is caused to lift the carrier 4.' (This position is shown on the drawings.)

Nowthe friction wheel may easily be returned to its initial position along therod i6, and after there has been effected, by rotation of the eccentric, the lowering of the turntable so that it engages the friction wheel, the apparatus is ready for recording or reproduction of a new disc.

The spring 24 also effects resilient engagement between the friction wheel and the turntable during the operation.

When the apparatus is not in use, it is suitable to maintain the friction wheel in released position from the turntable. The space between these parts may be controlled by means of a setscrew 25.

In order to enable the engagement and the release of the turntable from the friction wheel, the shaft l2 of the eccentric may be rotated manually or automatically as soon as the friction wheel reaches the position corresponding to the innermost spirals of the record. Figs. 2--4 disclose an embodiment of the automatic type, comprising an angular arm l9 pivoted to the base plate and preferably provided with rollers 20 and 2| at its ends. The roller 20 is arranged to project normally into the path of movement of any part which moves with the friction wheel, say a screw 22 (Fig. 3) attached to the journal l5, while the roller 2| is located close to a hook 23 attached to the shaft I2. If the friction wheel II is assumed to move inwardly to the center of the disc 9, the screw 22 will engage the roller 23 at a predetermined position of the friction wheel, so that the angular arm I9 is turned anti-clockwise, as seen from above, thus causing the roller 2|, as it engages the hook 23, to rotate the shaft I2 and the eccentric i3 in such a direction that the carrier 4 together with the turntable 3 are lifted and the turntable is released from engagement with the friction wheel under the action of the spring 24.

The end of the rod i6 may be provided with a handle.

It is'desirable that the motor driving the friction wheel be stopped automatically when the friction wheel is released from its engagement with the turntable. According to Fig. 5, a projection is'attached to the shaft i2 for this purpose. The said projection engages, in .a Predetermined position, a spring contact 5| cooperating with a fixed contact 52. The contacts 5| and 52 are either connected directly in the circuit of the electricalmotor arranged for the rotation of the friction wheel, or in a relay circuit controlling the rotation of the motor. The arrangement is made in such a manner that the circuit of the motor is interrupted when the shaft i2 occupies a position in which the turntable-is lifted from the friction wheel. The motor may also consist of a clockwork which may be actuated mechanically by the projection 50.

In order to facilitate the displacement of the friction wheel toward the center of the turntable 9, an arm of the non-rotatable journal'i5 may be connected to a spring 26 by means of a wire 21, or the like, guided by a suitable roller. The spring 26 is attached to a suitable stationary part of the apparatus and is of a size sufiicient to overcome the frictional resistance between the collar l4 and the journal l5 and the rod i6.

Fig. 6 shows an embodiment in which the carrier 4 may be lifted and lowered manually by means of an arm 28 provided with a projection 29 and combined with the arm 5 of the carrier, preferably by means of a spring 30. The dotted lines show the position of the arm when the turntable 9 has been lowered to engage the friction wheel, while the full lines show the released position.

Another embodiment is shown in Figs, 7 and 8. The eccentric i3 is provided with a cam, the length of which being such that at any position of the eccentric the cam engages either the roller 1 or a projection 32 mounted on the arm 5 above the eccentric. In the position shown onv the drawing's, the cam 3| engages the projection 32 so that the turntable 9 is lifted from the friction wheel. By this arrangement, there is avoided the shaking of the turntable 9 and the friction wheel II when they engage each other, e. g., during transport, which shaking may happen in the device according to Figs. 1-4 due to the elasticity of the spring 24. The turntable may be lowered to the friction wheel in the same manner as in the embodiment previously described.

In using records having diameters of different sizes, it is necessary to suit the initial position or the friction wheel at the outer portion of the turntable to the size of the record. To this purpose, an arm 35 (Figs. 7 and 8) is rotatably connected with journal l5, said arm being pivoted to an arm 36. The arm 36 is attached to a collar 31 which is journalled rotatably on a support 38, and which carries a pointer 39 above a fixed dial 40. This dial indicates the length of the diameter of the records by means of circular arcs or in another manner. If the pointer is rotated by means of a member 4| attached to the collar 31, the arms 35 and 36, the journal i5 and the friction wheel II are also moved. In this manner, the initial position of. the friction wheel may be predetermined to suit the diameter of the record to be used.

If it is desired to use the apparatus for the reproduction or recording of roller so that they reach the innermost portions 5 sired to eileot constant the usual kind of records, which require a constant rotational velocity of the turntable, the radial displacement of the friction wheel must cease so that the said wheel is caused to operate at a constant radius. Figs. 7 and 8 show a device adaptable to this purpose. Accordingto this embodiment, the angular arm I9 is arranged on a displaceable slide 42. When the slide occupies the position indicated by full lines in Fig. 7, the roller 20 is engagedby the screw 22 when the friction wheel reaches the inner spirals, but if the slide be displaced to the left, i. e., to the dotted position, the collar l4 and the friction wheel may be moved past the in which there areno helical grooves. The slide is guided by pins 43a and a, respectively, projecting into grooves l3 and 44, of which the latter has an angular shape so that the slide may be locked in the desired position under the action of a spring 45.

When the friction wheel H has been displaced to the center of the turntable 9 sufliciently far in order to give the turntable the desired rotational speed, the collar ll should be locked in this position in order to prevent the frictionwheel from moving radially. A suitable device for this is also shown in lam 8. The

of the turntable 9 p e fl-gl'iE-Qai e de 52 carries a vertical arm 46 part 41 which, in is caused to engage provided with a projecting the left position of the slide, a groove 48 on the collar ll.

The surface of the lower side of the turntable which the friction wheel engages when it is derotational velocity of the may be provided with concentric the ribs, of the friction wheel the wear of these turntable, grooves, in which may engage. In this manner, ribs is avoided.

0 Since certain changes may be made in the above construction and different embodiments of the invention couldbe made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described the invention, what is claimed as new and useful and desire to'secure by Letters Patent is: I

1. In a device of the character described, the combination comprising a 'tumtable, movableactuating said turntable, and automatic means adapted for moving said turntable away from said means when said movable means have moved to a predetermined position.

2. In a device of the character described, the

' tuating means when for causing said actuating means not in a limiting means operated by table and mounting means away from said actuating means after said actuating means have actuated said turntable at a predeterminedsp'eed.

4. In a device of the character described, the combination comprising mounting means,-a turntable pivotally mounted in said mounting means, means adapted for actuating said turntable and means including a cam-like element and adapted to move said mounting means away from said actuating means, and means operatedby said aced to operate said cam means.

- 5. In a device of the characterdescribedr thfe ed to move said mounting means away from said actuating means, means operated by said actuating means when said actuating means are in a predetermined pos'tion of operation and adapted to operate said cam means, and means adapted to cease actuating said turntable and operated by said cam onerating means.

a device of the character described, the

combination comprising mounting means, a turntable pivotally mounted in said mounting means, means adapted for actuating said turntable, means including a cam-like element and adaptsaidxcam operating means.

7. In a device of the character described, the combination comprising mounting means, a turntable pivotally mounted in said mounting means, means adapted for actuating said turntable, means including a cam-like element and adapted to move said mounting means away from said actuating means, and means operated by said actuating means when said actuating means are in a predetermined position of operation and adapted to operate said cam means, said cam-like ele-- ment being adapted for raising said mounting means against the force of gravity away from said actuating means.

8. In a device of the character described, the combination comprising mounting means, a turntable pivotally mounted in said mounting means, means adapted for actuating said turntable, means tending to move said mounting means away from said actuating means, and cam means operated by said actuating means and preventing,

at a predetermined position of said cam means,

said mounting-moving means from moving said mounting means. V 9. In a device of the character described, the combination comprising mounting means, a turntable pivotally mounted in said mounting means, means adapted for actuating said turntable, resilient means tending means away from said actuating means,

said actuating means and preventing, at a predetermined position of said cam means, said resilient means from moving said mounting means.

10. In a device of the character combination comprising mounting means,'a turnfor actuating saidturntable,- means including a cam-like element and adaptsaid actuating means are in, r a predetermined position of operation and adapted to move said mounting means away from said to move said mounting and camdescribed, the I I table pivotally mounted in said mounting means,

means adapted for actuating said turntable,

means tending to move said mounting means away from said actuating means, cam means operated by said actuating means and preventing, at a predetermined position of said cam means, said mounting-moving means from moving said mounting means, and a frame, said mounting means being pivoted on said frame.

11. In a device of the character described, the combination comprising mounting means, a tumtable pivotally mo a cam, a friction wh adapted for actuating said turntable and movable along a shaft, said mounting means being movable and the motion thereof being controlled by said cam, an axle supporting said cam, a bell crank movable by said wheel in said mounting means,

during a portion of the wheel's motion along said shaft and adapted to rotate said axle. y g

12. In a device of the character described, the combination comprisingmounting means, a tumtable pivotally mounted in said mounting means;

a cam, a friction wheel adapted for actuating said turntable and movable along a shaft, said mountin'g means being movable and the motion thereof being controlled by said cam, an axle supporting said cam, a bellcrank movable by said wheel during a portion of the wheels motion along said shaft and adapted to rotate said axle, and resilient means between said cam and said mounting means. .4

' HENRIK FABIAI; STENMAN. 

